SSOC Tohban Report for Week 31 (24-Jul-2000 to 30-Jul-2000) SSOC: N.Shinohara, T.Shimizu KSC: T.Miyawaki, H.Ishizaki 0. Meeting Attendees Akita, Hudson, Kahn, Kano, Kosugi, Kubo, Nagata, Ogawara, Sakao, Shimizu, Takeda ------------------------------------------------------------------------------- 1. Solar Activity Solar activity level was moderate on the first half of the week, with 7 M class flares, but the activity level decreased on the last half of the week. M8.0 flare starting at 2:46UT on 25 July was well observed with Yohkoh. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: ====================================================================== JST Day UT Start Time Pass Table ID ====================================================================== Tuesday AM 24-JUL-00 19:22 4 000724 P4 ARS1 DIFF* Wednesday AM 25-JUL-00 14:24 2 000725 P2 ARS1 DARK Wednesday AM 25-JUL-00 19:30 5 000725 P5 ARS1 STD* Thursday AM 26-JUL-00 14:31 2 000726 P2 ARS2 VLA Thursday AM 26-JUL-00 16:13 3 000726 P3 ARS2 SERTS* Thursday AM 26-JUL-00 19:38 5 000726 P5 ARS1 STD* Friday AM 27-JUL-00 12:57 2 000727 P2 ARS2 VLA Friday AM 27-JUL-00 18:03 5 000727 P5 ARS1 STD* Saturday AM 28-JUL-00 13:04 2 000728 P2 ARS1 STD Sunday AM 29-JUL-00 14:54 3 000729 P3 ARS1 STD* ====================================================================== 2.2 STT Timer setting The STT timer was set during Pass 3 on Wednesday, 26-Jul-00 JST (ID: 000725-1033). ------------------------------------------------------------------------------- 3. Special Operations 3.1 Flare trigger level The flare trigger level (SXS-NFL) was changed to 255C/S during Pass 3 on Tuesday, 25-Jul-00 JST (ID: 000724-1136). 3.2 Partial Eclipse on weekend Yohkoh met a partial eclipse (only less than 10%) during this weekend. For safety of attitude control, ORBIT TIMER DIS and ORBIT TIMER ENA1 OGs were included around the eclipse period. Note that ORBIT TIMER ENA1 OG was updated on Saturday. 3.3 Normal Pointing Nothing changed. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors None 4.2 BCS Errors A BCS error was found at Pass 5 on Wednesday, 26-Jul-00 JST (ID: 000725-1239). The error was recovered during Pass 4 on Thursday, 27-Jul-00 JST (ID: 000726-1136). 4.3 SSOC Careless Mistake in OP There was a careless mistake in the preparation of the OP covering a 34-m operation (ID: 000729-0823). The mistake is to include an unnecessary (also wrong) OG for antenna change was inserted in the OP, causing A->B antenna change instead of (B)->A. Note that antenna change from B->A was expected 1 minute after AOS time and OP_FIRST_GUESS already set A by AOS OG. Some part of repro data might be lost due to low signal level. 4.4 Wrong universal time in some KSC repro data in SIRIUS SIRIUS operators found a funny data (duration: 8 sec) from KSC repro data. This is stored in SIRUS with name "0007251002" (00/7/25 16:11:50-16:11:58 UT). SSOC found that wrong universal time is stamped for the data. From SXT image odometor and BDR write page information, this data should be 15:37:42-15:37:50 UT. SIRIUS operators have met similar data a few times recently. I asked SIRIUS operators to look into this problem. Also asked to report if they found another cases. ------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred and/or requested: =========================================================================== DSN/NASA Week Schedule Changes =========================================================================== Final 31 0 additions; 2 cancellations Final 32 0 additions 3 cancellations Forecast 33 0 additions; 1 cancellations by SSOC Strawman 34 59 cancellations (Seko: 2, SSOC: 57) =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_31)---- 195 76 1509 corrupted tape requested 17-Jul no response tape requested 21-Jul Closed/ same data 198 76 0704 corrupted tape requested 17-Jul no response tape requested 21-Jul Closed/ same data 198 76 0844 corrupted tape requested 17-Jul no response tape requested 21-Jul Closed/ same data 199 82 1215 not received requested 21-Jul Closed/ correct data 199 82 1358 not received requested 21-Jul Closed/ correct data 205 82 0756 - 0808 / 7288 blocks Problems with the TOTS antenna had to position the 9m antenna on the satellite. ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule - Yohkoh lost 7 20-m passes (6 to ASCA, 1 to HALCA). - There were 8 passes (down-link only) with the 34m. - Yohkoh will lose 10 20-m passes (6 to HALCA, 4 to ASCA). - There will be 11 passes (down-link only) with the 34m. ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: Takeda, Akita KSC: Ishizaki, Koyama 7.2 STT Timer Setting The next STT TIMER SET is due on 1-Aug-2000 (Tuesday) UT. 7.3 OP OP and command sheets for Monday (31-Jul-2000) night were prepared and were sent to KSC. 7.4 Holiday Schedule The next satellite holiday will be 6-Aug, Sunday JST. 7.5 34m ANT Operation Manual Sakao san sent us 34m ANT Operation Manual in Japanese and revised 34m ANT Operation Sheet. Please read them. ------------------------------------------------------------------------------ 8. Unchanged Hikitsugi Items from Previous Weeks: 8.1 Weekend Terminators If possible, please schedule terminator opportunities on any weekend table (i.e., if room permits). 8.2 Software Problems PR_GEV with /hc keyword produces a temporary output file but does not print it at the printer. 8.3 OP_FIRST_GUESS Problem (1999-w38, 1999-w45) In a situation with two KSC cancellations on each of two days (a rare condition) the BDR optimization feature of OP_FIRST_GUESS crashed. After experimentation, we found that it ran OK without the final cancellation request (two the first day, but just the first one on the second day). The second one then had to be removed manually. Records of the problem were forwarded to Lemen-san, but no answer had arrived at the time of writing. 8.4 Keeping Wallops Contacts (1999-w42, 1999-w45) This is not a new policy, but to emphasize (paraphrased from e-mail from Hugh Hudson): We should keep all valid Wallops passes, independent of day/night status, in order to maximize our Wallops use and minimize our DSN use. NASA won't give us many DSN passes anyway, so if we select a Goldstone pass in preference to a Wallops one, we'll normally just lose both. Another reason is that CANCEL_DSN software needs some repair, since it seems to replace the DSS identifier WGS with 0. This is likely to cause confusion, but of course if we don't cancel Wallops passes we won't have this problem often. 8.5 OP_FIRST_GUESS Problem (1999-w46, 1999-w45) During the preparation of 991109-1238 OP,991110-1135 OP and 991111-1032 OP OP_FIRST_GUESS crashed with the message "OP_START_END: problem with detection of LOS/AOS/DSN Repro events". This problem was solved by changing OP_FIRST_GUESS options: choose optimization 1 rather than 2. 8.6 DSN Pass Additions (2000-w20) *** Don't forget to request pass additions! *** Yohkoh loses DSN passes as follows: (1) Canceled due to conflicts with ASCA (by Seko-san) (2) Canceled because Santiago is unavailable (3) Canceled by the SSOC tohbans (4) Deleted by DSN The Tohbans SHOULD COMPARE the STRAWMAN, PRELIMINARY and FINAL schedules -------------- for each week to see if some of the passes lost by case (4) could be replaced by ones from case (3). This means it may be possible to request pass additions for the PRELIMINARY and FINAL week schedules from the (case (3)) STRAWMAN cancellations. (The cancellations by Seko will generally be marked in red ink, and those by SSOC by pencil: Only request additions from the penciled cancelations). The routine to use is ADD_DSN: e.g., IDL> ADD_DSN, 28, /prelim and IDL> ADD_DSN, 29, /final Decide on the complete list of passes to be added and select them like CANCEL_DSN. Then ftp and email the appropriate file. 8.7 OP Sequence for KSC Operation Using 34 m Antenna (2000-w24) KSC downlink operation with 34 m antenna has started since the end of May 2000. Since we cannot send any command to Yohkoh with 34 m antenna, the downlink operation is conducted with OP commands. ------------------------------------------------------------------------------ === END ===